Hitachi 090001, Operator'S Manual

Page: 368 / 442

MAINTENANCE
7-94
Adjust Bucket Linkage
The machine is provided with a bucket adjustment system to
take up play in the linkage. When play in the linkage increases,
remove and install shims as follows:
1. Place the bucket in a stable position.
2. Run the engine at slow idle. With the bucket on the
ground, slowly swing counterclockwise slightly until the
top of the left bucket boss contacts the arm.
3. Stop the engine. Pull the pilot control shut-off lever to
the LOCK position.
4. Slightly loosen three bolts (1) using a 22 mm wrench.
Remove all shims (2) from clearance (c) between plate
(3) and bucket. As shim (2) is a dual partitioning type, it
can be easily removed by slightly loosening bolt (1) and
inserting tip of a screw driver into the contact surface of
left and right shims (2).
5. Push and hold bolts (1) to remove all clearance (a)
between arm and boss (4). Holding boss (4) against arm
increases clearance (b). Install as many shims (2) into
clearance (b) as possible.
6. Install remaining shims (2) into clearance (c) and tighten
bolts (1) to 140 N·m (14 kgf·m).
f
NOTE: The total number of shims (2) used in clearance (b)
and (c) are 6×2=12. Remaining shims (2) must be installed in
clearance (c) to prevent arm end face or bolt damage. Replace
boss (4) with new one if measurement (d) is 5 mm or less.
M503-07-056
Clearance Adjust Part
Bucket Pin Arm Top Boss
Bucket
Section A
d
A
A
a
b c
2
4
3
1
M1G6-07-010